" 25."a-b-a^(2)+b^(2)

Fractorise: 25 -a^(2) -b ^(2) - 2ab

If a * b = a^(2) + b^(2) and a.b = a^(2) - b^(2) , then the value of (5 * 2).25 is

Factorise : 25a^(2) - 9b^(2)

Find the product : (i) (x+3)(x^(2)-3x+9) " " (ii) (7+5b)(49-35b+25b^(2)) (iii) (5a+(1)/(2)) (25a^(2)-(5a)/(2)+(1)/(4)) " " (iv) (a+b-2)[a^(2)+b^(2)+4(a+b)+4] .

Factorise : 25(2a - b)^(2) - 81 b^(2)

Factorise: a ^(4) + 25b^(4) - 10a^(2)b^(2)

If a+b=25 and a^(2)+b^(2)=225 then find ab

If a ** b = a ^(2) + b ^(2) and a . b = a ^(2) - b ^(2), then the value of (5 * 2) . 25 is

Simplify (5a-2b) (25a^(2)+10ab+4b^(2)_) -(2a+5b) (4a^(2)-10ab+25b^(2)).